/**
 *    Copyright 2009-2021 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.apache.ibatis.submitted.primitive_result_type;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.Reader;

public class IbatisConfig {

    private static SqlSessionFactory sqlSessionFactory;

    private IbatisConfig() {
    }

    private static synchronized void init() {
        if (sqlSessionFactory == null)
            try {
                final String resource =
                        "org/apache/ibatis/submitted/primitive_result_type/ibatis.xml";
                Reader reader = Resources.getResourceAsReader(resource);
                sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
    }

    public static SqlSession getSession() {
        if (sqlSessionFactory == null) {
            init();
        }
        return sqlSessionFactory.openSession();
    }
}
